Pierco Foundation falls out of wood frame

[porlauren]

New to beekeeping, new to beesource; recently assembled 20 wooden frames with pierco foundation where 2 of the frames wont hold the foundation, it falls out with the slightest nudge. Any experience, advice? Thanks!

[beegeorge]

I have never used pierco foundation,, but you could try stapling it in or hot glue